Transporter



Oct. 15, 1929. I w. H. VOGEL TRANSPORTER Filed June '16, 1927 Patenteda. 15, 1929 UNITED STATES PATENT OFFICE.

wnnrm n. VOGEL, or -mermaND rm, minors, nssrenon To INTERNATIONALcomBUs'rIoN ENGINEERING CORPORATION, 01- NEw Yon'x, N. 1., A. coaromrronOF DELAWARE Application med June 16, 1921. Serial Io. 199,164.

i This invention relates to apparatus for transporting finely dividedmaterials such, for example, as pulverized coal.

The invention has to do with that class of transport apparatus in whichthe material is transported through a lineby air under compression, thematerial being fed from a suitable source of supply to the sphere ofaction of the pneumatic pressure by means of a feed screw.

In this-class of apparatus blowing bac "of the air is to be prevented,and a number of difi'erent arrangements have been heretofore proposedfor this purpose. In many instances, however, the desired result canonlybe obtained with heavy power consumption, and it is one of the primaryobjects of my invention toprovide an effective transport device in whichthe power consumption is relatively small.

7 Another object of the invention'is to vide a feeder for a transportsystem which is. simple and economical to manufacture and which can bereadily 2 operating condition.

How the foregoing, together with such maintained-in effective otherobjects and advantages as may hereinafter appear, or are incident to myinvention, are realized is illustrated in the accompanying drawings,wherein- Fig. 1 is a side elevation in partial section through atransport feeder embodying my mvention;- 7

Figs. 2 and 3 are, respectively, a side and end elevation of one of theunits from which the feed screw is built up, and

Fig. 4 is an end elevation of the means provided to prevent blow back ofthe air. I

Referringnow to the drawings, the reference character A denotes thefeeder barrel having an inlet B to receive the material to betransported. The feed screw is indicated at C. Secured over thedischarge end of the barrel is a connection D for delivering thematerial discharged from the screw into the conveyor line E, Powderedcoal enters the inlet B from any suitable source of supply through thethroat F, and it is'advanced through the barrel by the screw to thesphere of action of the compressed air. .The comscrew. The provision ,ofthe disk, however,

pressed air for transporting the coal is admitted to the air chamber 7at the end of the barrel through the pilpe 8, and it discharges into theconnection through a plurahty of ports or openings 9 arranged annularlyof the dischar e end of the barrel.

The screw 5 is mounted on the shaft 10, and at the end of the screw andwithin the discharge end of the barrel I provide a seg-' mental disk 11which rotates with the shaft and screw. In the preferred form of myinvention this segmental disk is semi-circular, i. e., it is a halfdisk, and it is carried on a sleeve-like portion 12 fitting. the shaftand keyed thereto. The disk'extends' transverse-' ly of theaxis of theshaft preferably at right angles thereto, and the end of the threadterminates adjacent the edge of the disk; The screw preferably has athread of constant pitch, but the disk has the eifect of decreasing thecapacity of the last flight of the screw with respect to the otherflights.

Under regular operating conditions the apparatus functions substantiallyas follows. The screw is rapidly revolved and advances the coal enteringthe inlet end of the barreL. Usually the lea flights of the screw do notrun full, for e reason that a portion of the coal is rejected because ofthe centrifugal action of the rapidly revolving causes the last flightor so of the screw to become filled with coal particles suflicientlydensely as to prevent the 'air from blowing back. The air admittedthrough the ports 9, therefore, operatesto tra rtthe coal dischargedfrom the end of the arrel into the connection D through the line. I havefound it very eifcctive to deliver the air around the coal dischargingfrom the By making the and 1ts sleeve 'separately from the screw, Isimplify manufacture and am also enabled to replace the disk if itshould wear more rapidly than the screw. For substantially the samereasons, I

refer t6 make up the screw out of a numr of elements which arecomplementary and preferably counterparts of one another. These elementseach comprise a sleeve-like portion 13 having a shoulder 14 at each endand carrying a half thread 15, the ends of which terminate at theshoulders. From an inspection of Fig. 1 it will be seen that. theseelements can readily be assembled in the form of a screw, the elementsbeing nonrotatably associated with the shaft by any preferred means,suchas the locking bolts 16.

A screw of any desired length can be made up from these elements, and ifany portions of the thread wear more rapidly-than others, the same canbe readily replaced.

Reverting to the. power requirements of the transporter, I have found,by experience, that the provision of the disk enables me to effectivelyprevent blow back, while, at the same time, the power required forturning the screw is relatively small. This is probably attributable tothe fact that only the vlast flight or so of the screw becomescompletely filled. I have also found that the transporter is economicalof air and is able to transport for long distances with relatively lowair pressures. I also find that I am enabled to use a shorter screw thanhas heretofore been required.

As the form'of the disc 11 may vary according to the material beingtransported, it is to be understood that the term segmental disc is tobe liberally construed, that is, it is intended to mean discs which aresemicircular, less than or more than semicircular.

I claim 1. A pneumatic transport device for transporting pulverized coalor other finely divided material comprising a barrel having an inlet, afeed screw in said barrel, a segmental disc at the end of said screw,and means for admitting conveying air beyond said disc.

2. A pneumatic transport device for transporting pulverized coal orother finely divided material comprising a barrel having an inlet,-afeed screw in said barrel, a segmental disc at the end of said screw, adischarge connection from the barrel to a conveyor line, and means forsupplying conveyinlg air to said connection.

3. pneumatic transport device for transportin pulverized coal or otherfinely divided material comprising a barrel havin an inlet, a feed screwin said barrel, a su stantially semi-circular disc at the end of saidscrew and extendin transversely of the axis of said screw, and means foradmitting conveying air beyond said disc.

4. -A pneumatic transport device comprising a barrel having an inlet anddischarge opening, a shaft extending through said barrel, a screw. onsaid shaft com osed of complementar interlocking mem ers each carryinghal a screw thread, said members heing assembled end to end on theshaft, a

segmental disc member at the end of said 05 screw' complementary to theend member of the screw, and means for admitting conveying air beyondsaid disc member.

5. A pneumatic transport device comprising a barrel having an inlet and.discharge opening, a shaft extending through said barrel, a screw onsaid shaft composed of complementary interlocking members each rel, ascrew on said shaft composed of complementary interlocking members eachbeing composed of a hollow body portion with a shoulder at each endandcarrying ahalf screw thread with its ends terminating at theshoulder, a segmental disc member at the end of said screw complementaryto the end member of the screw, and meansfor admittinIg conveying airbeyond said disc member. n testimony whereof I'havehereunto set In hand.V

y WILLIAM'H. VOGEL.

